Easy Peasy

I had previously written about how to batch resize images and rename on Ubuntu, but on Mac OS X, there is an even quicker way to resize images with a command line utility called sips.

Open up a Terminal. Go the directory where your images or photos are located. Lets say you want to max width of 640 pixels. This is all you do:

sips -Z 640 *.jpg

Easy peasy.

(image source)